双阻带小型化频率选择表面的设计

摘要

The general method of improving the transmission characteristic stability of a frequency selective surface is to miniaturize its unit cell. By loading capacitor and increasing the electric length, this paper designs a dual stop - band miniaturized frequency selective surface. With two periodic structures the proposed frequency selective surface demonstrates the dual stop - band quality, the lumped capacitor between the cross structures can greatly reduce the series resonance frequency and realizes lower stop - band characteristics in S and C band, the meandering lines will increase the series inductance to achieve higher stop - band in the Ku band. The simulation results demonstrate that this structure keeps the excellent transmission stability with respect to different incidence angles. Meanwhile,because the designed frequency selective surface is nice in symmetry, its transmission characteristic is identical for the TE and TM modes of plane wave. This paper verifies the feasibility of the miniaturized method by loading lumped capacitor and increasing the electric length, which is of great reference value for designing frequency selective surface.%设计了一种通过加载电容和增加电长度的方法实现小型化的双阻带频率选择表面.这种频率选择表面单元具有双周期结构,从而实现了双阻带特性.在十字单元结构之间加载集中电容,可以大大降低单元结构的串联谐振频率,实现S及C波段的带阻特性;金属短线的扭曲结构则通过增加电长度提高等效电感,得到Ku波段的带阻特性.仿真结果表明:对不同角度入射波该结构保持了十分稳定的传输特性,同时由于良好的对称性,该结构对平面波的2种模式--TE及TM模式传输特性基本相同,验证了通过加载电容和增加电长度实现小型化的方法,对FSS的设计具有很好的参考价值.